Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1f5de8e24cddfe…

MALICIOUS

PDF

87.1 KB Created: 2021-07-01 14:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a17c299cb2dd50e127c5ff90e27a5c3b SHA-1: a7e50f1cc92a4b75a415ab622a08264604c31e91 SHA-256: 3e1f5de8e24cddfe7608088b4f2ffe29f9e6576373dcfa96bfe838c01997a5a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external sites, many hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be redirecting users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=what+do+toucans+eat PDF link annotation
    • http://aksaaydinlatma.com/img/editor/image/file/gadarum.pdfIn PDF document text
    • http://candientuvibra.com/images/file/54298856506.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/73015616163.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ee2330f6d---34307921894.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/e1a4ecefefdd9422f20066d498efab56/35202755039.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ur5lcmp0as426p34c0ddlgjbp2/paroxalew.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/24b99ef506af18b8d29f5827e9bed251/67091214560.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/gamokegatodidogasokaxal.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/eb886729993fce02c357556e9160c4bb/47767446828.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a79005d9b8---raboretekiwat.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c3fba20bd---nodosezonefurapibime.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852ec1610af---80521507975.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fdfae4a9e28eba956bb7fae4e82911e0/tamugejafowopipulomakuses.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9eadc7c03---doxed.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/sv2pqsc3nnon8nacmcj4mdkn97/zuxapenipunu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c71d32754e7---30129935946.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/702d6aba71a93490e3ebbd98fa6bfb43/nixakuzojada.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb3ce88ef---27977306326.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/63615671964.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8g39jnh14djb8lms00r54s9ast/37435022379.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1b9fbae613d3785587e2bdcf75ff1378/lisevovubesubujin.pdfIn PDF document text
    • http://aven.su/userfiles/file/52425831063.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/70524944875.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d905444e3b9---63719325407.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/xukufurovuzetixakenalosu.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/6d8468183ad35f90a546418b7af9f0ca/92263679536.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 10320 bytes
SHA-256: f5bc8d7d786bad2f557fdb26c826111941fddc2c93c601deddab4d5e2effe7dc
font_01_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 16808 bytes
SHA-256: 365d756068cdaf8df6571ddfca69fffe83863236451e3e1e80d5b849bde70681
font_02_sfnt_off000135d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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